A current focus of precision flat glass producers is on the development of new glass compositions for use in flat panel displays. This is being done in response to requests from device manufacturers whose products and/or processes are making new demands of the substrates. Today, there are numerous glass compositions used in flat panel displays. They range from soda lime glass, where the low cost has kept it as the substrate of choice for applications with low material demands, to fused silica, the use of which, to date, has been limited by manufacturing issues. This paper will review the ongoing development of new glass substrates. This has been driven in large part by the liquid crystal display application, but its outcome will be capitalized upon by other display manufacturers including color plasma, electroluminescent, and field emission displays. Particular attention will be given to the critical properties of chemical durability, thermal expansion, and thermal shrinkage.